﻿/************************************************************************

   Extended Silverlight Toolkit

   Copyright (C) 2010-2012 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://extendedsilverlight.codeplex.com/license

   Please purchase a commercial version of this toolkit if you are using
   it in a commercial product. The commercial versions support the project,
   and also include more features for each control, priority support,
   source code, updates, removed watermark, and a proprietary license.

   Visit http://xceed.com and follow @datagrid on Twitter.

  **********************************************************************/

using System;
using System.Collections.Generic;
using System.Windows.Threading;
using Xceed.Silverlight.Data.Stats;

namespace Xceed.Silverlight.Data
{
  internal sealed class SafeGroupStatFunctionsSelector : IGroupStatFunctionsSelector
  {
    #region Constructor

    internal SafeGroupStatFunctionsSelector(
      IGroupStatFunctionsSelector selector,
      Dispatcher dispatcher )
    {
      if( selector == null )
        throw new ArgumentNullException( "selector" );

      if( dispatcher == null )
        throw new ArgumentNullException( "dispatcher" );

      m_selector = selector;
      m_synchronizationContext = new DispatcherSynchronizationContext( dispatcher );
    }

    #endregion

    #region UnsafeSelector Internal Property

    internal IGroupStatFunctionsSelector UnsafeSelector
    {
      get
      {
        return m_selector;
      }
    }

    private IGroupStatFunctionsSelector m_selector;

    #endregion

    #region IGroupStatFunctionsSelector Members

    IEnumerable<StatFunction> IGroupStatFunctionsSelector.GetStatFunctions( DataPath groupPath )
    {
      return m_synchronizationContext.InvokeFunc( m_selector.GetStatFunctions, groupPath );
    }

    #endregion

    #region Private Fields

    private DispatcherSynchronizationContext m_synchronizationContext;

    #endregion
  }
}
